package cn.edu.ctbu.dp01.service;

import cn.edu.ctbu.dp01.constant.REnum;
import cn.edu.ctbu.dp01.dao.StudentRepository;
import cn.edu.ctbu.dp01.entity.Student;
import cn.edu.ctbu.dp01.exception.RException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Example;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import java.util.List;

import static org.springframework.data.jpa.domain.AbstractPersistable_.id;

@Service
public class StudentService {
    @Autowired
    public StudentRepository studentRepository;
    public List<Student> getAll() {
        return studentRepository.findAll();
    }
    public Page<Student> getAll(Pageable pageable) {return studentRepository.findAll(pageable);}
    public Page<Student> getAll(Example<Student> example , Pageable pageable) {return studentRepository.findAll(example,pageable);}
    public Student findById(int id) {
        return studentRepository.findById(id).get();
    }
    public List<Student> findByName(String name) {
        return studentRepository.findByNameLike(name);
    }
    public List<Student> findByNameAndPassword(String password,String name) {
        return studentRepository.findByNameAndPassword(name, password);
    }
    public void insert(Student student) {
        studentRepository.save(student);
    }
    public Student add(Student student) {
        return studentRepository.save(student);
    }
    public Student update(Student student) {
        return studentRepository.save(student);
    }
    public void delete(Integer id) {
        studentRepository.deleteById(id);
    }
    public Student validateUsernameAndPassword(String username, String password) throws Exception{
        List<Student> students = studentRepository.findBySno(username);
        if(students.size()>0){
            Student student = students.get(0);
            if(student.getPassword().equals(password)){
                return student;
            }else {
                throw new RException(REnum.LOGIN_ERR);
            }
        }else {
            throw new RException(REnum.LOGIN_ERR);
        }
    }
}
